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Galileo (Unit) – A Short Note

The galileo (symbol: Gal) is a unit of acceleration used mainly in the field of geophysics, especially gravimetry, which measures the Earth's gravitational field.

One galileo is defined as:

1 Gal = 1 centimeter per second squared (1 cm/s²)

It is a non-SI (non-International System) unit, named after the Italian scientist Galileo Galilei in honor of his pioneering work on gravity and motion.

Because the Gal is a relatively large unit for precise gravity measurements, smaller subunits are often used:

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  1 milligal (mGal) = 0.001 Gal

  
  
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  1 microgal (µGal) = 0.000001 Gal

  
  

In practical terms, Earth's surface gravity is about 980 Gal, but variations in local gravity fields (due to terrain, density, etc.) are often measured in milligals or microgals.

The galileo unit is essential in geophysical surveys, oil exploration, and earthquake studies.

Yard and Square Yard – A Short Note

A yard is a unit of length used in the imperial and U.S. customary systems. One yard equals 3 feet or 36 inches, which is approximately 0.9144 meters. Yards are commonly used to measure longer lengths or distances, such as in sports fields, fabric measurements, or landscaping.

A square yard (written as yd²) is a unit of area. It represents the area of a square that is one yard (3 feet) on each side. One square yard equals 9 square feet or 1,296 square inches, and approximately 0.836 square meters. Square yards are often used to measure surfaces like carpeting, lawns, or large fabric areas.

In short, a yard measures how long something is, while a square yard measures how much surface area it covers. Understanding both is useful in construction, gardening, and textile industries.